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Updated: Jun 20, 2026
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A Silicon-tipped Fiber-optic Sensing Platform with High Resolution and Fast Response
Published on: January 7, 2019
Summary
Noise in fiber-optic Sagnac interferometers originates from Rayleigh backscattering fluctuations. This study demonstrates noise reduction using phase modulation or low-coherence sources, achieving a 8 x 10(-4) deg/sec rotation rate.
Area of Science:
- Optics
- Fiber Optics
- Interferometry
Background:
- Fiber-optic Sagnac interferometers are susceptible to noise.
- Rayleigh backscattering phase fluctuations, caused by temperature and vibration, are a major noise source.
Purpose of the Study:
- To identify the primary noise source in fiber-optic Sagnac interferometers.
- To investigate methods for reducing this noise.
- To quantify the achieved noise-equivalent rotation rate.
Main Methods:
- Identified phase fluctuation of Rayleigh backscattering as the noise source.
- Implemented phase modulation in the fiber ring.
- Utilized a low-coherence light source.
Main Results:
- Demonstrated noise reduction techniques for fiber-optic Sagnac interferometers.
- Achieved a noise-equivalent rotation rate of 8 x 10(-4) deg/sec.
Conclusions:
- Phase modulation and low-coherence sources effectively mitigate Rayleigh backscattering noise.
- The developed methods significantly improve the performance of fiber-optic Sagnac interferometers.
